Switch



March 25, 1930. R, NI ARSHA L 1,751,826

SWITCH Filed Sept. 10, 1927 IN V EN TOR.

BY 77 K m/f ATTORNEYS.

Patented Mar. 25, 1930 3 UNITED STATES PATENT OFFICE JOHN R. MARSHALL, OF MCKEAN; PENNSYLVANIA SWITCH Application filed September 10, 1927. Serial No. 218,673.

such wires. Features and details of the invention Will appear more fully from the specification and claims.

A preferred embodiment of the invention is illustrated in the accompanying drawings as follows Fig. 1 shows a section on the line 1--1 in Fig. 2.

Fig. 2 an end View of the device.

Fig. 3 is a side elevation of the device.

Fig. 4 a section on the line 4-4 in Fig. 1.

Fig. 5 a section on the line 55 in Fig. 1.

1 marks the base of the device and 2 the cover. These are formed of insulatingmaterial provided with hinge lugs 3 through which a hinge pintle 4 extends. Securing bolts 5 are provided with heads 6 which are molded in sockets 7 in the base. The bolts 5 extend through connector bars 8, the upper surfaces of which are preferably serrated so as to engage and grip an inserted wire 9. Nuts 10 are arranged on the bolts 5 and these have their engaging surfaces preferably serrated. The wire 9 is arranged on the connector bar and under one side ofthe nuts 10. As the nuts are screwed up the side engaging the wire moves toward the end of the base, theresult being that when the nut is screwed up and the wires are put under tension the tension tends to turn the nut in a direction to tighten it.

A bridge piece 11 is adapted to be brought into and out of contact with the connector bars 8. The bridge piece is secured on a stem 12. The stem has an axial socket 13 extending from its lower end which is screwthreaded. A bolt 14 having a head 15 is em bedded in the insulating material of the base, the end of the bolt protruding between the ends of the connector bar and extending into the socket 13. The stem 12 has an external screw thread 16 of the same pitch as the threads of the bolt 14 and these operate in a nut 17 embedded in the material of the cover. An insulating-handle 18 is arranged on the top of the stem 12.

The wires are'initially clamped in place v with the cover open by meansof the nuts 10 and the cover is then closed with the stem 12 screwed to an outward position in the nut 17.

As the cover is closed the stem 12 is screwed downwardly to the nut 17 until it engages the screw14. The continued turning ofthe stem screws the stem downwardly through the nut 7 and on to the bolt 15 until the bridge piece 11 is clampedon the connector bars, thus'closing the connection. Thus the stem not only clampsthe bridge piece in contact but also looks the cover in closed position.

lVhat I claim as new is f 1. In a switch, the combination of a base; a cover secured to the base; wire clamps on the base comprising connector bars, said clamps being adapted to secure the ends of conductors to physically connect said conductors and adapt the same to sustain opposing endwise strain; a bridge piece; and means moving the bridge piece into and out of contact with the bars.

2. In a switch, the combination of a base; a cover secured to the base; wire clamps on the base comprising screws mounted in the base; connector bars on the screws; nuts on the screws adapted to engage conductor wires between the nuts and connector bars, said clamps so formed being adapted to secure the ends of the conductors to physically connect said conductors and adapt the conductors to sustain opposing endwise strain on said conductors; and a bridge piece movable to close and open the connection between the connector bars.

3. In a switch, the combination of a base; a cover secured to the base; wire clamps on the base comprising screws mounted in the base; connector bars on the screws; nuts on the screws adapted to engage conductor wires between the nuts and connector bars; and a bridge piece movable to close and open the connection between the connector bars, the sides of the nuts arranged to engage the wire being moved toward the end of the base as the nuts are tightened.

4. In a switch", the combination of a base; a cover secured to the base; means adapted to secure ends of wires to physically connect the wires and secure them against opposing endwise strain comprising connector bars; a bridge piece adapted to bridge the connectors; a screw extending through the piece; and a G" bridge stem operating on the screw.

" 5. In a switch, the combination of a base; a cover secured to the base; means adapted to secure ends of wires to physically connect the wires and secure them against opposing m endwise strain comprising connector bars; a bridge piece adapted to bridge the connectors a screw extending through the piece; a bridge stem operating on the screw; a nut on the cover; and threads on the stem operating in 15 thB nut. V. I I I l V 6. In a swltch, the combination of a base; clamping screws secured in the base; connector bars on the clamping screws; nuts on the clamping screws adapted to clamp ends 5gb of conductor wires to physically connect'said wires to sustain opposing endwise strain; a bridge between the connector bars; a bolt secured in the base and extending through the bridge; .a stem carrying the bridge and 2 having a screw-threaded socket operating on the bolt; external threads on the stem; and a nutin the cover in which said external screw threads operate.

In testimony whereof I have hereunto set to my hand.

' 7 JOHN R. MARSHALL. 

